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Linux/net/ipv6/netfilter/ip6table_filter.c

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  1 /*
  2  * This is the 1999 rewrite of IP Firewalling, aiming for kernel 2.3.x.
  3  *
  4  * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
  5  * Copyright (C) 2000-2004 Netfilter Core Team <coreteam@netfilter.org>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License version 2 as
  9  * published by the Free Software Foundation.
 10  */
 11 
 12 #include <linux/module.h>
 13 #include <linux/moduleparam.h>
 14 #include <linux/netfilter_ipv6/ip6_tables.h>
 15 #include <linux/slab.h>
 16 
 17 MODULE_LICENSE("GPL");
 18 MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
 19 MODULE_DESCRIPTION("ip6tables filter table");
 20 
 21 #define FILTER_VALID_HOOKS ((1 << NF_INET_LOCAL_IN) | \
 22                             (1 << NF_INET_FORWARD) | \
 23                             (1 << NF_INET_LOCAL_OUT))
 24 
 25 static int __net_init ip6table_filter_table_init(struct net *net);
 26 
 27 static const struct xt_table packet_filter = {
 28         .name           = "filter",
 29         .valid_hooks    = FILTER_VALID_HOOKS,
 30         .me             = THIS_MODULE,
 31         .af             = NFPROTO_IPV6,
 32         .priority       = NF_IP6_PRI_FILTER,
 33         .table_init     = ip6table_filter_table_init,
 34 };
 35 
 36 /* The work comes in here from netfilter.c. */
 37 static unsigned int
 38 ip6table_filter_hook(void *priv, struct sk_buff *skb,
 39                      const struct nf_hook_state *state)
 40 {
 41         return ip6t_do_table(skb, state, state->net->ipv6.ip6table_filter);
 42 }
 43 
 44 static struct nf_hook_ops *filter_ops __read_mostly;
 45 
 46 /* Default to forward because I got too much mail already. */
 47 static bool forward = true;
 48 module_param(forward, bool, 0000);
 49 
 50 static int __net_init ip6table_filter_table_init(struct net *net)
 51 {
 52         struct ip6t_replace *repl;
 53         int err;
 54 
 55         if (net->ipv6.ip6table_filter)
 56                 return 0;
 57 
 58         repl = ip6t_alloc_initial_table(&packet_filter);
 59         if (repl == NULL)
 60                 return -ENOMEM;
 61         /* Entry 1 is the FORWARD hook */
 62         ((struct ip6t_standard *)repl->entries)[1].target.verdict =
 63                 forward ? -NF_ACCEPT - 1 : -NF_DROP - 1;
 64 
 65         err = ip6t_register_table(net, &packet_filter, repl, filter_ops,
 66                                   &net->ipv6.ip6table_filter);
 67         kfree(repl);
 68         return err;
 69 }
 70 
 71 static int __net_init ip6table_filter_net_init(struct net *net)
 72 {
 73         if (net == &init_net || !forward)
 74                 return ip6table_filter_table_init(net);
 75 
 76         return 0;
 77 }
 78 
 79 static void __net_exit ip6table_filter_net_exit(struct net *net)
 80 {
 81         if (!net->ipv6.ip6table_filter)
 82                 return;
 83         ip6t_unregister_table(net, net->ipv6.ip6table_filter, filter_ops);
 84         net->ipv6.ip6table_filter = NULL;
 85 }
 86 
 87 static struct pernet_operations ip6table_filter_net_ops = {
 88         .init = ip6table_filter_net_init,
 89         .exit = ip6table_filter_net_exit,
 90 };
 91 
 92 static int __init ip6table_filter_init(void)
 93 {
 94         int ret;
 95 
 96         filter_ops = xt_hook_ops_alloc(&packet_filter, ip6table_filter_hook);
 97         if (IS_ERR(filter_ops))
 98                 return PTR_ERR(filter_ops);
 99 
100         ret = register_pernet_subsys(&ip6table_filter_net_ops);
101         if (ret < 0)
102                 kfree(filter_ops);
103 
104         return ret;
105 }
106 
107 static void __exit ip6table_filter_fini(void)
108 {
109         unregister_pernet_subsys(&ip6table_filter_net_ops);
110         kfree(filter_ops);
111 }
112 
113 module_init(ip6table_filter_init);
114 module_exit(ip6table_filter_fini);
115 

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